Horizontal Beams showing zero axial force when they should have non-zero value on application of lateral force on 2D Frame
Question:
I am modelling simple 2D frames for the purpose of analysing their structural response from Unit Lateral Load loads applied at the top of Frame. I have kept all connections as pinned to compare the interal forces with those from hand calculations. However, the horizontal members which have been modelled as beams in the frame are showing zero axial force (Fx) when there should be non-zero axial forces in the beams. Why is this so?
All members have been modelled as Beam elements
Answer:
Hi,
I am modelling simple 2D frames for the purpose of analysing their structural response from Unit Lateral Load loads applied at the top of Frame. I have kept all connections as pinned to compare the interal forces with those from hand calculations. However, the horizontal members which have been modelled as beams in the frame are showing zero axial force (Fx) when there should be non-zero axial forces in the beams. Why is this so?
All members have been modelled as Beam elements
Answer:
Hi,
The zero axial forces in the horizontal members are caused by the story diaphragm. If you change it from 'Consider' to 'Do not consider', you can see non-zero axial forces.
Regards,
DK Lee
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DataImage71.png 19 KB |
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Axial Force[1].PNG 54 KB |
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Leadenhall South Frame Original (On Site Sections).mgb 101 KB |
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DataImage76.png 150 KB |
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DataImage2.png 45 KB |
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DataImage27.png 28 KB |
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Model.PNG 25 KB |
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Axial Force.PNG 39 KB |
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Leadenhall South Frame Original (On Site Sections) RIGID Connections.mgb 104 KB |